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  3. A number of theories have been proposed to explain the situation.A tested B used

A number of theories have been proposed to explain the situation.A tested B used

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问题 A number of theories have been proposed to explain the situation.
选项 A tested
B used
C suggested
D announced
答案C
解析propose和suggest是同义词，都是“建议、提议、提出”的意思，注意用法略有不 同，两者后面都可以跟动词的-ing形式，但是propose后面可以用动词不定式，suggest 则不可以。可以说 We propose to have a meeting,但是不可以说 We suggest to have a meeting。test 测试、检验，announce 宣布、公布。
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